Nested PVOBS
If you’ve ever had to pull Clearcase UCM components from one project vob (PVOB) to another, you probably did some hair-pulling the first time you had to do. If you manage a mature environment or have had to integrate a new development team and source code base into your existing one, this IBM document might help you understand how it all hangs together.
I’ve managed multi-million line source code bases that came from five or six separate companies and multiple platforms (Linux, Solaris, Windows) and needed to marry components from one set of PVOBS to projects in another. It all comes down to AdminVOB hyperlinks.